Initiator process variable

Hi.
Excuse me for stupid questions but I am new in Flowable. I have some experience with Alfresco Activiti and I cannot find answer.
In Alfresco Activiti I can use variable initiator and it’s properties in listener using Alfresco execution script like this:

execution.setVariable(‘userFullName’, initiator.properties.firstName +" " + initiator.properties.lastName);

In Alfresco Activiti I can also use logger to write information into console

logger.log("initiator email: " + initiator.properties.email);

and bmp_package too

bpm_package.children.length

Can I use something similar in Flowable.